Cleaning composition



. crete particles Arthur s. Weygandt, caveats Heights, out, asslgnor to The Grasselli Chemical company,

Cleveland, Ohio, a aeration of Delare No Drawing. Application y 31, 193%, Serial No. 728,387

3 Claims.

The present invention refers to cleaning composition particularly for household uses which comprises sodium drated magnesium bisulfate and partially dehychloride' hydrates.

Sodium bisulfate is used extensively as a cleaning compound for household use. suggested to mix It has also been sodium chloride with sodium bisulfate to increase the efiiciency of the mixture. Such mixtures of an acid salt and a chloride have the great and in a moist hydrochloric acid gas which is very. corrosive.

disadvantage that in dry form atmosphere they slowly liberate I have found that this drawback of the dry mixtures of acid sulfate and chloride can be substantially completely overcome if I mix with the sodium bisulfate a partially dehydrated magnesium chloride has a film or On heating hydrate which on its surface layer of magnesium oxide. magnesium chloride hydrates they slowly decompose with evolution of hydrochloric acid gas and By conducting the decomposition takes place on resulting in a formation of magnesium oxide. this operation carefully on disof a magnesium chloride hydrate the surface only product which has on its outside a film or coating of a basic magnesium compound which for matter of simplicity I shall call magnesium oxide.

The novel cleaning composition of my invention comprises therefor discrete dlum bisulfate mixed partially dehydrated particles of sowith discrete particles of magnesium chloride hydrate, or magnesium chloride particles having on their surface a. slight coating oxide.

of magnesium The proportionate amount of the two compounds in the mixture ponderant amount the ingredient, the mainly relied upon, nesium chloride forming some hydrochloric acid ing composition is I can add to the mixtures of when the cleanadded to water.

sodium bisulfate and partially dehydrated magnesium chloride various inert materials, such as talcum, kieselguhr,

or other abrasives without detracting from the advantages of the combination of the two main enm.

Besides suppressing the formation of hydrochloric acid gas in the solid mixtures, the use of magnesium chloride particles. which has been partially dehy the surface of drated, prevents dehydrated magnesium chloride hydrates can beprepared from the finely ground individual compounds.

It is, however, convenient and for many purposes preferable to use the two components in either globular or flake form.

In producing magnesium chloride in globular form it is easy to conduct the operations in such a manner that the globules as formed are submitted to a current of dehydrating gas whereby they lose water and some hydrochloric acid gas, leaving on the surface of the globules a coating of magnesium oxide. Similarly the flaking of magnesium chloride hydrates can beso conducted as to produce a product which has a thin surface layer of magnesium oxide. It is, of course, also possible to take preformed magnesium chloride hydrate globules or flakes and partially dry them until a film of magnesium oxide is formed on their surface.

Magnesium chloride flakes containing 48.3%

MgClz were dried in an oven at C. until a thin, white opaque film of a basic magnesium compound was formed over the entire surface of the flakes, the MgClz content on basis of chlorine rising to 50.7 These flakes were mixed with dry sodium bisulfate flakes, the mixture containing 10% of the partially dehydrated magnesium chloride. This mixture was non-segregating and chemically stable.

A similar mixture was prepared from undehydrated magnesium chloride. There was an almost immediate chemical reaction with evolution of hydrochloric acid gas.

I claim:

1. A cleaning composition which will liberate H01 when dissolved in water comprising discrete particles of sodium bisulfate and discrete particles of heat treated magnesium chloride which have formed on their surface only as a result of said heat treating a surface film of a basic magnesium compound and having a core of magnesium chloride, said composition being substantially non-caising and does not liberate hydrochloric acid gas when dry.

2. The composition of claim 1 in which the 0 

